JPH0564091U - Bicycle cantilever brake spring adjuster - Google Patents

Abstract

(57) [Summary] [Object] To enable adjustment in a spring cantilever brake spring adjusting device for a bicycle, while preventing the spring receiving member from tilting and causing poor contact between the adjusting screw and the spring receiving member. [Structure] When the adjusting screw 10 is rotated to adjust the rotation of a spring receiving member 8 that receives and acts on the return spring 7, even if the receiving member 8 is tilted with respect to the rotation axis X, The receiving portion 9a has a receiving member so that the tilting of the adjusting screw 10 is greatly displaced and the contact amount between the adjusting screw 10 and the adjusting screw receiving portion 8a is less than a preset value. 8 and the tilting of the receiving member 8 is suppressed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, a return spring, which urges a brake arm to swing toward a brake-disengaging side, is provided with a spring bearing member that is rotatable with respect to the brake arm and an adjustment screw that acts as a stopper on the spring bearing member. A bicycle cantilever configured to be supported and supported by an arm and to adjust the urging force of the return spring by rotationally adjusting the spring receiving member with respect to the brake arm by screwing the adjusting screw with respect to the brake arm. Brake spring adjustment device.

[0002]

[Prior Art]

 In the above cantilever brake, conventionally, the mounting flexibility of the spring bearing member to the support portion has been relatively large so that the spring bearing member smoothly rotates when adjusting the spring force.

[0003]

[Problems to be solved by the device]

 Conventionally, when adjusting the spring force, the adjusting screw that is in contact with the spring receiving member is rotated to exert a twisting operation force on the spring receiving member, and the spring receiving member is used for this twisting action and the mounting flexibility. In some cases, the member moved in a state of inclining with respect to the axis of rotation of the member, and the spring receiving member and the adjusting screw were in a poor contact state with a small contact margin, making adjustment difficult. An object of the present invention is to modify the spring receiving member and the adjusting screw so that the spring can be adjusted while maintaining the contact between the spring receiving member and the adjusting screw in a good state.

[0004]

[Means for Solving the Problems]

 In the spring adjusting device for a cantilever brake for a bicycle according to the present invention, in order to achieve the object, in the one described at the beginning, the spring receiving member is brought into contact with the spring receiving member, and the spring receiving member has a rotational axis. On the other hand, a receiving portion for suppressing tilting is provided in the brake arm or the member connected to the brake arm. Its action and effect are as follows.

[0005]

[Action]

 By setting the flexibility of attachment of the spring bearing member to the support portion to a relatively large value, the spring bearing member can smoothly rotate when adjusting the spring force. Then, if the degree of action of the receiving portion with respect to the spring receiving member is set appropriately, the spring receiving member will not move with respect to the rotating shaft core during the adjustment of the spring force due to the mounting interchange and the twisting operation with the adjusting screw. However, if the inclination increases, the receiving part contacts the spring receiving member and the inclination of the spring receiving member stops within the allowable range, and the spring receiving member contacts the adjusting screw. The allowance is secured for what is necessary to smoothly adjust the rotation of the spring receiving member.

[0006]

[Effect of the device]

 By adding the receiving portion, it is possible to maintain the spring receiving member and the adjusting screw in a proper contact state for adjusting the spring force while setting the mounting flexibility of the spring receiving member relatively large. The spring force can now be adjusted smoothly from both sides of the degree of rotation with respect to the part and the degree of contact with the adjustment screw.

[0007]

【Example】

 As shown in FIG. 3, one of the pair of brake arms 1 and 1 is swingably supported around one of the pair of body frames F and F on the left and right sides of the wheel W about the axis X. And the other brake arm 1 is attached to the other vehicle body frame F so as to be swingable around the axis X, and the free end side of one brake arm 1 is braked. When the brake arm 2 is connected to the wire 2 and the free end side of the other brake arm 1 is connected to the brake wire 2 via the connector 3, it is put into a use state, and is operated by pulling and loosening the brake wire 2. Thus, a cantilever brake for a bicycle is configured. That is, when the pulling operation of the brake wire 2 is performed, the left and right brake arms 1 and 1 swing upward due to this operating force, and the brake arms 1 and 1 are attached to the intermediate portions of the brake arms 1 through the shoe tightening tool 4. A certain brake shoe 5 presses against the side surface of the wheel rim 6 to apply friction so as to apply friction braking. When the brake wire 2 is loosened, the left and right brake arms 1, 1 swing downward due to the biasing action of the return springs 7 shown in FIG. 1 provided at the respective base ends thereof. The brake shoes 5 are separated from the side surface of the wheel rim 6 and the brakes are released so as to release the application of braking.

As shown in FIG. 1, in the one brake arm 1, the spring receiving member 8 for the return spring 7 is press-fitted into the assembling hole of the brake arm 1 so that the brake arm 1 is not displaced. The bushing 9 thus connected is attached so as to rotate about the axis X as the axis of rotation, and the adjusting screw 10 is screwed onto the screw receiving portion 1a provided on the brake arm 1 by simultaneous molding. The arm spring spring cover 11, which is attached to the bush 9 and covers the return spring 7, is provided with an adjusting hole 11a so that the brake arm 1 returns to the cut side. The spring adjusting device is configured so that the adjustment can be made. That is, the biasing force of the return spring 7 is changed by inserting a tool (not shown) into the inside of the arm side spring cover 11 from the adjustment hole 11a and rotating the adjustment screw 10. It is configured as follows. The end portion of the return spring 7 on the vehicle body side penetrates the vehicle body side spring cover 12 and enters the spring insertion hole of the brake pedestal 13 to be received and supported by the vehicle body frame F via the brake pedestal 13. As clearly shown in FIG. 2, the brake side end of the return spring 7 is configured to enter the notch 8b of the spring receiving member 8 and engage with the spring receiving member 8 so as to be integrally rotatable. The adjusting screw 10 is configured to come into contact with the arm portion 8a of the spring receiving member 8 while being supported by the brake arm 1 for screwing into the supporting portion 1a so as to act as a stopper on the spring receiving member 8. Thus, the brake side end of the return spring 7 is received and supported by the brake arm 1 via the spring receiving member 8 and the adjusting screw 10. Therefore, when the adjusting screw 10 is rotated, the adjusting screw 10 is screwed to the inside or the outside of the arm side spring cover 11 with respect to the screw support portion 1a of the brake arm 1. When the adjusting screw 10 is screwed to the inside of the cover, the adjusting screw 10 pushes the arm portion 8a to move the spring receiving member 8 in the turning direction A with respect to the brake arm 1. The movement is adjusted, and the spring receiving member 8 twists the return spring 7 to the winding side or the rewinding side, which is determined by the winding direction of the return spring 7. When the adjusting screw 10 is screwed to the outside of the cover, the adjusting screw 10 acts to pull down the arm portion 8a, and the elastic restoring force of the return spring 7 is used as the operating force to brake the spring receiving member 8. The arm 1 is moved and adjusted to rotate in the rotation direction B, and the spring receiving member 8 twists and adjusts the return spring 7 to the rewinding side or the winding side, which is determined by the winding direction thereof.

As shown in FIG. 1, when the bush 9 is provided with a stepped portion that forms a receiving portion 9 a for the spring receiving member 8, when adjusting the urging force of the return spring 7, the bush 9 of the spring receiving member 8 is adjusted. Even if the spring bearing member 8 moves in a state of inclining with respect to the rotation axis X due to the mounting flexibility with respect to and the twisting operation by the rotating adjustment screw 10, consideration is made so that the spring can be adjusted smoothly. I am doing it. That is, when the receiving member 8 moves in a state of inclining with respect to the rotation axis X, the receiving portion 9a comes into contact with the inner peripheral side portion of the spring receiving member 8 due to this inclination, and the spring receiving member 8 rotates. The spring bearing member 8 is configured to be restrained from tilting so that the tilt angle with respect to the moving axis X remains at the set tilt angle. Further, the set inclination angle is such that the adjustment screw 10 pushes or receives the spring receiving member 8 by the adjustment screw 10 such as the contact area between the arm portion 8a of the spring receiving member 8 and the adjustment screw 10 and the positional relationship. Is set so that it can be done without any problems.

[Other Embodiment] FIG. 4 shows another structure of the spring adjusting device, in which the receiving portion 11b for the spring receiving member 8 is formed by the arm side spring cover 11. That is, although the arm side spring cover 11 is a separate component from the bush 9, it is fixed to the cover supporting groove 9b of the bush 9 by the mounting portion 11c, and the supporting reaction force from the spring receiving member 8 acts. However, it is attached to the bush 9 so as not to move. Therefore, the spring cover portion 11b that contacts the spring receiving member 8 serves as a receiving portion.

Further, the receiving portion for the spring receiving member 8 may be formed by a bush or a spring cover, or may be formed by a member dedicated thereto. Alternatively, it may be directly connected to the brake arm 1. That is, the brake arm 1 may be provided, or the member connected to the brake arm 1 may be provided. Therefore, the bush 9 is referred to as a member 9 connected to the brake arm 1.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a sectional view of a brake arm mounting structure.

FIG. 2 is a cross-sectional view of a spring receiving member arrangement portion.

FIG. 3 is a front view of a bicycle cantilever brake.

FIG. 4 is a cross-sectional view of another embodiment spring adjusting device.

[Explanation of symbols]

 1 Brake arm 7 Return spring 8 Spring receiving member 9a, 11b Retaining portion 10 Adjustment screw X axis core

Claims (1)

[Scope of utility model registration request] 1. A return spring (7) for swinging and urging a brake arm (1) toward a brake disengagement side, a spring bearing member (8) rotatable with respect to the brake arm (1), and this spring bearing. The spring receiving member is received and supported by the brake arm (1) via an adjusting screw (10) acting as a stopper on the member (8), and a screwing operation of the adjusting screw (10) with respect to the brake arm (1). A spring adjusting device for a bicycle cantilever brake, which is configured to adjust a biasing force of the return spring (7) by adjusting rotation of (8) with respect to the brake arm (1), the spring receiving member (8). ) To prevent the spring receiving member (8) from tilting with respect to the rotation axis (X) of the spring receiving member (9), (11b). A spring cantilever brake spring adjustment device for a bicycle provided on the brake arm (1) or a member (9) connected to the brake arm (1).